Percussive tool



Nov. 27, 1928. I 7 1,692,937

G. w. HULSHIZER i PERGUSS IVE TOOL Filed Sept. 192'? Patented Nov. 27, 1928.

UNITED STATES eeann r AT E NT OF'FIC s;

GEORGE'VI. HULSHIZER, STEEVARTS'VILLE, NEW" JERSEY, ASEzIGIlQR "J ZNGERSOLL- BAND CGMYPANY, 01? JERSEY CITYQNEW JERSEY, A CQRPORAIIOH OF NEW JERSEY.

PERCUSSIVE TOOL.

Application filed September to all of these ends the invention consists of the combin tion of elements and arrangement of parts having the. general mode of operation substantially as. hereinafter de- .SlllOQCl and claimed and illustrated in the'ac companyinp; drawings, in which I Figure 1 an elevation in section of a percussiye tool constructed-in accordance with the practice of the invention, showing the piston in position to admit ressure fluid to the rearward end of the cylinder,

Figure 2 a view similar to Figure 1 showing the piston in the other extreme position, and y r I Figure 3 is a transverse" View taken through Figure l on the line 33 looking in the direction indicated by the arrows. V

deterring to the drawings, A designat'esa cylinderofa percussive tool havinga piston chamber B whicho 'iens'at its front end into a pocket C. The front end of the piston chamber B may be sealed in any suitable manner. In the drawings a bushingDis indicated for, this purpose and said bushing also has a bore?) for the reception of a working I implement, only the shank F of which is shown. 1 fit the rearward end of the cylinder A is 'loeated'a back head G which may be secured to the cylinder A by means of the usual side bolls shown) and has a passage H which conveyspressure fluid trom a suitable source of supply to the tool, The back-head'G is vfurther provided with an exhaust port J which may lead to the rearward end of the tool for exhausting fluid to the atmosphere.

" in accordance with the present invention,

an inlet plug); K is disposed concentrically within the piston. chamber B and has a flange ll its rearward end seate'd in a bore O at the rearward end of thepiston chamber B.

2,1927. Serial No. 211108.

The inlet plugli has a central passage P which extends to apoint nearthe front end of said plug. Ports Q are preferably formed at the front end of thepassage P for the eduction of pressure fluid from the said lnthe piston chamber B is a reciprocatory han ner piston inst the working implement F. The pision B this instance is oi uniform external diame er a n 'l h as operates sl; the inlet plug no,

2. its front end larger 'dianzc than the bore S. 7

end of the chamber with the outer surface of and which bore terminates Preferably'at the front T are formed radial ports-U for admittino pressure fluid from. said chamber into an inlet passage V leading to the rearward end of the cylinder A. I

' Formed in the piston R are a plurality of passages XV which when the piston occupies its extreme forward position, register at the rearward endswith the supply ports Q. The passages N open at their front ends into the front end of the piston chamber B to admit pressure fluid thereto torimpelling the piston R rearwardly'.

Suitable means are provided for exhausting the fluid utilized for actuating the piston from the ends of the piston, chamber B. These means in the present instance consist of an exhaust plug 'X disposed concentrically with respect to theinlet plug, K intowhich. it extends; The exhaust plug X5 like the inlet plug K, also has a lateral flange Y which seatson the flange ol' the inlet plug K with its forward face and at its rearward end is seated in the back head G for centralizing the R for delivering blows central bore S which 00- a chamber T of somewhat said back head with respect to the cylinder A.

The diameter of the stem Z otthe exhaust plug X is somewhat smaller than that ofthe passage P to permit a free flow of pressure fluid through the passage P to the front end thereof. v

Inthe exhaust plug X isformed a longitudinal passageb which registerswith the passage J' in the back head G and extends to a point near th'elront'end of the plug X. Preferably adjacent the frontend of the passage 1) vare formed exhaust ports 6 'whiclr register. with ports (Z in the inletplug' IQ said ports 0' and (Z being controlled by the piston R.

A suitable escape for pressure fluid from the chamber T is provided in the form of a passage 6 which leads from a point near the I front end of the piston chamber B rearwardly As will be observed, the stem Z of the exhaust plug X is provided with suitable bosses fadjacent the exhaust ports to seal the said exhaust ports 0 against communication with the passage P. The outer ends of the bosses f will thus lie snugly against thewall of the passage P and tend to stiffen the inlet plug K against the effects of vibration.

The operation of the device is as follows: WVith the piston in its extreme rearward po sition illustrated in Figure 1, pressure fluid may'p'ass through the ports Q, into the 01121111 ber T, thence through the ports U in the pisston and the inlet passages V into the rearward end of the cylinder. Such pressure fluid admitted into the rearward end'of the I cylinder, together with the fluid in the chamber T, will impel the piston forwardly to strike against the working impl ment F. As the piston R approaches its extreme forward position, the rearward end of the piston will uncover the exhaust ports cl to permit the exhaust of pressure fluid from the rearward end of the cylinder through the said exhaust ports d and the passage 6 .to the atmosphere.

At the same time the ports U in the piston will be in registry with the passage 0 and the pressure fluid in thechamber T will then be exhausted through these channels into the rearward end of the cylinder and, passing over the rearward end of the piston, will flow through the passage Z) to the atmosphere, together with the exhaust fluid from the rearward end of the cylinder.

Moving of the piston into the forward position described will carry the rearward ends of the passages W into registry with the sup,- ply ports Q, thus permitting a supply of pressure fluid to flow into the pocket G to act I against the front surface of the piston for reversing the travel of the piston. Such pressure fluid in the front end of the cylinder by expanding will move the piston again to its initial position. In this position the rearward ends of the passages NV will be in registry with the exhaust ports (Z and the fluid in the front end of the cylinder may thou exhaust throughthe said passages W, the ports (Z and the passage 6' to the atmosphere, thus completing the cycle of operations.

As will be observed the exterior of the cylinder A is of substantially cylindrical shape, thus enabling the tool to be disposed in a pipe or other similar device whereby it may be guided and supported. This, as well as the.

method of exhausting the fluid from the cylinder, is particularly advantageous when a tool of the type described is used for submarine drilling or for other similar work in haust passage J extend only to a point slightly rearwardly of the percussive element of the tool,it will readily be understood that these passages may be extended to any suitable point rearwardly of the tool, elth er through the body of the tool or through sultable connections leading thereto.

I claim: p I 7 1. A fluid actuated percussive tool, comprising a cylinder having an inlet passage leading to oneend thereof, a reciprocatory piston in the cylinder having a chamber,- a hollow inlet plug extending into the chamber constantly associated with a supply of pres sure fluid, said inlet plug and piston having ports communicable for inter nittently admitting pressure fluid into, the chamber and through the inlet passage'to one end of the cylinder, passages in the piston for conveying pressure fluid to the other end of thecylinder, and a hollow exhaust plug in the inlet plu for conveying exhaust fluid from the cylinder. r

2. A fluid actuated percussive tool, com

prising a cylinder having an inlet passage leading to one end thereof, a piston in the cylinder having a chamber, a hollow inlet plug 7 extending into the chamber intermittently admitting pressure fluid into the chamber and through the inlet passage for actuating the piston in one direction,passages in the piston intermittently registering with the inlet plug ion leading to one end thereof, a piston in the cyl inder having a chamber, a hollow inlet plug extending into the chamber intermittently. adm mitting pressurefluid into the chamber. and

through the inlet passage for actuating'the piston'in one direction, passages in the piston intermittently registering with'the inlet plug for supplying pressure fluid to the other end'of the cylinder for actuating the piston in the opposite direction, and a. hollow exhaust plug in, the inlet plug for coi'iveying ex 1 haust fluid from the cylinder.

4. A fluid actuated percussive-t0ol,.com-

prising a cylinder having an inlet passage lGELCllH to one end thereof a oiston 1n the c "linder having a chamber, a hollow inlet plug extending into the chamber intermittently admitting pressure fluid through the chamber into the inlet passage for actuating the piston in one dlrection, passages in the piston intermittently registering with the inlet plug for supplying pressure fluid to the other end of the-cylinder for actuating the piston in the opposite direction, a hollow exhaust plug in the inlet plug for conveying exhaust fluid from the cylinder, and a passage in the cylin der for conveying exhaust fluid from the chamber to the discharge plug.

5. -A fluid actuated percussive tool, com prising a cylinder having an inlet passage leading to one end thereof, a reciprocatory piston in the cylinder having a chamber, a hollow inlet plug extending into the chamber having supply ports for intermittently admitting pressure fluid into the chamber, ports in the piston adapted to register with the chamber and the inlet passage to admit pressure fluid to one end of the cylinder, a

- hollow exhaust plug in the inlet plug, and a' passage in the piston registering with the supply ports for admitting pressure fluid to theother end of the cylinder and with the exhaust plug for exhausting such fluid to the atmosphere.

6. A fluid actuated percussive tool, comprising a cylinder having an inlet passage leading to one end thereof, a reciprocatory piston in the cylinder having a chamber, a

' hollow inlet plug extending into the chamber having supply ports for intermittently admitting pressure fluid into the chamber, ports in the piston affording communication between the chamber and the inlet passage to admit pressure fluid to one end of the cylinder, a hollow exhaust plug in the inlet plug,

for conveying exhaust fluid from the chaInher to the exhaust plug.

7. A fluid actuated percussive tool, comprising a cylinder having an inlet passage leading to the rearward end thereof, a reciprocatory piston in the cylinder having a chamber, a hollow inlet plug extending into the chamber having supply ports for intermittently admitting pressure fluid into the chamber, ports in the piston aflording communication between the chamber and the in let passage for admitting pressure fluid to the rearward end of the cylinder, a hollow exhaust plug in the inlet plug having exhaust ports controlled by the piston, passages in the piston registering with the supply ports for admitting pressure fluid to the front end of the cylinder and with the exhaust ports for exhausting suchfluid from the front end of the cylinder, and a passage in the cylinder for conveying exhaust fluid from. the. chain her to the exhaust plug.

In testimony whereof I have signed this specification.

GEORGE w. HULSHIZER. 

